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20-1
CHAPTER
20
Backplane Replacement
This chapter explains the replacement procedure for backplanes (BPs). It covers the
following:
■ Section 20.1, “Overview of the BP” on page 20-1
■ Section 20.2, “Cold Replacement” on page 20-1
As a replacement method for BPs, only the cold replacement method can be used.
For the definition of the replacement method, see Section 4.1, “Types of Replacement
Procedures” on page 4-2.
20.1 Overview of the BP
This section provides an overview of the BPs and shows their mounting locations.
A BP has connectors for interconnecting replaceable units in a cabinet. The following
BPs are available:
■ BP_A: used for interconnecting the CMUs and IOUs of the M8000
■ BP_B: used for interconnecting the CMUs, IOUs, XBUs of the M9000
■ PSUBP: used for interconnecting power supply units (PSUs)
■ FANBP: used for interconnecting FAN units
20.2 Cold Replacement
BPs are mounted in a cabinet, and it is necessary to remove many other components
before it can be accessed. Consequently, active maintenance cannot be performed on
BPs. Cold replacement must be used when replacing them.